Hi Sohaila, both MKS and Bronkhorst, mass flow controllers seem to be the most popular. They typically come with computer interface, as well as serial communications, to allow you to interface with them yourself. I guess for such an experiment you would want to use a flow through system, and probably have a larger sized flow controller with an inert gas to dilute the one you want to detect. Be warned however, flow controllers are expensive, around $1200 new.
Thank you a lot Phil, I will ask about MKS.
Can you please from your experience tell me what do you mean by larger controller with an inert gas . you mean flow ratio controller. or the best connect two tube with valve to the mass controller just to mix them before insertion in the mass controller. or I can have another valve to the inert gas and then use the mass controller to the target gas.
Hi Sohaila, I would suggest having say a 10 ml/min flow controller for the inert gas, and then a smaller one for your detection gas, say 1 ml/min, then connect the outputs of the 2 before passing to your sensor (you will have a better idea of the actual flows yourself.) But the idea being that the flow rate should be OK with 100% of detection gas flowing only, but then you can dilute this with the inert gas to a very high degree (assuming you are trying to test for very dilute amounts?) This will give you a huge range of gas concentrations you will be able to obtain. You may need to check on how your detector responds to an actual flow rate also as it is likely to change i.e. a fixed concentration of detection gas, but with different flow rates.
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